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Session 2

Session 2. Module 3: Layout Managers Module 4: Swing Menu Components. Module 1 Review. Module 2 Review. Module 3: Layout Managers. Objectives. Package java.awt. Setting a Layout to a Container. container.setLayout ( LayoutObject );. container.setSize (width,height);

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Session 2

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  1. Session 2 Module 3: Layout ManagersModule 4: Swing Menu Components

  2. Module 1 Review Layouts Manager and Menus / Session2 / 2 of 23

  3. Module 2 Review Layouts Manager and Menus / Session2 / 3 of 23

  4. Module 3: Layout Managers • Objectives Package java.awt Layouts Manager and Menus / Session2 / 4 of 23

  5. Setting a Layout to a Container container.setLayout ( LayoutObject ); container.setSize (width,height); // or container.pack(); container.setVisible(true); Layouts Manager and Menus / Session2 / 5 of 23

  6. Setting a Layout to a Container in NetBeans Layouts Manager and Menus / Session2 / 6 of 23

  7. FlowLayout FlowLayout is default layout of Jpanel Layouts Manager and Menus / Session2 / 7 of 23

  8. BorderLayout BorderLayout is default layout of JFrame, JApplet container.add( component com, int position) frame.add(btnNorth, BorderLayout.NORTH); Layouts Manager and Menus / Session2 / 8 of 23

  9. GridLayout JPanel p= new JPanel(); GridLayout g= new GridLayout(2,2); p.setLayout(g); p.add(btn1); p.add(btn2); p.add(btn3); p.add(btn4); Layouts Manager and Menus / Session2 / 9 of 23

  10. CardLayout Panel_Main Panel_1 Panel_2 CardLayout • Advantage: • Allows several containers and their • associated components to share the • same space in the container • Disadvantages • Not visual appealing as a tabbed pane • Requires other components like • buttons or drop-down to plip through. Panel_3 Control: next() previous() first() last() show() Layouts Manager and Menus / Session2 / 10 of 23

  11. Module 3 Summary Layouts Manager and Menus / Session2 / 11 of 23

  12. Module 4: Swing Menu Components Objectives Layouts Manager and Menus / Session2 / 12 of 23

  13. JMenuBar JCheckBoxMenuItem JMenu JRadioButtonMenuItem icon JMenuItem JSeparator text mnemonic Menu Components Layouts Manager and Menus / Session2 / 13 of 23

  14. JMenuBar class // Create a JFrame JFrame f= new JFrame(“Menu demo”); // Create a JMenuBar JMenuBar mnuBar = new JMenuBar(); // set menu bar to the frame f.setJMenuBar(mnuBar); Layouts Manager and Menus / Session2 / 14 of 23

  15. JMenu class • Constructors: JMenu() JMenu(String label) // create a menu bar JMenuBar mnuBar= new JMenuBar(); // create a JMenu JMenu mnuFile= new JMenu(“File”); // add a menu to menu bar mnuBar.add(mnuFile); // add a separator to menu mnuFile.addSeparator(); // set mnemonic : Alt + F mnuFile.setMnemonic(KyEvent.VK_F); Layouts Manager and Menus / Session2 / 15 of 23

  16. JMenuItem class • Constructors: • JMenuItem() • JMenuItem(Action a) • JMenuItem(Icon icon) • JMenuItem(String text) • JMenuItem(String text, Icon icon) • JMenuItem(String text, int mnemonic) • Important methods • setEnable(boolean enable) • setMnemonic ( int mnemonic) • setAccelerator(KeyStroke keyStroke) • Add menu item to menu menuObject.add(menuItemObject) • Event handling • ActionEvent • ActionListener • public void actionPerformed(ActionEvent evt) Layouts Manager and Menus / Session2 / 16 of 23

  17. JCheckBoxMenuItem class • Constructors: • JCheckBoxMenuItem() • JCheckBoxMenuItem(Action a) • JCheckBoxMenuItem(String text) • JCheckBoxMenuItem(Icon icon) • JCheckBoxMenuItem(String text, Icon icon) • JCheckBoxMenuItem(String text, boolean b) • JCheckBoxMenuItem(String text, Icon icon, boolean b) • Important methods • boolean isSelected() • get/ setSelected (boolean) • get/setState(boolean) • Add menu item to menu menuObject.add(checkBoxMenuItemObject) • Event handling • ItemEvent • ItemListener • public void itemStateChanged(ItemEvent evt) Layouts Manager and Menus / Session2 / 17 of 23

  18. JRadioButtonMenuItem To control the selected state of a group of radio button menu items, use a ButtonGroup object • Constructors: • JRadioButtonMenuItem() • JRadioButtonMenuItem(Action a) • JRadioButtonMenuItem(String text) • JRadioButtonMenuItem(Icon icon) • JRadioButtonMenuItem(Icon icon, boolean selected) • JRadioButtonMenuItem(String text) • JRadioButtonMenuItem(String text, boolean selected) • JRadioButtonMenuItem(String text, Icon icon, boolean selected) • Important methods • boolean isSelected() • get/setSelected (boolean) • Add menu item to menu menuObject.add(radioMenuItemObject) • Event handling • ActionEvent • ActionListener • public void actionPerformed (ActionEvent evt) Layouts Manager and Menus / Session2 / 18 of 23

  19. JPopupMenu class Constructors: • JPopupMenu() • JPopupMenu(String label) Common methods: Layouts Manager and Menus / Session2 / 19 of 23

  20. JFileChooser Dialog box Constructors: JFileChooser() JFileChooser(String curDir) Layouts Manager and Menus / Session2 / 20 of 23

  21. JFileChooser Dialog box … • Controlling on File dialog box: • File getSelectedFile() • File getCurrentDirectory() • setFileFilter (FileFilter obj) • Create a Filter: public class ImageFilter extends javax.swing.filechooser.FileFilter { // override: boolean accept (File) // override: String getDescription() } Layouts Manager and Menus / Session2 / 21 of 23

  22. JToolBar class Constructors: JToolBar() JToolBar (int orientation) JToolBar (String title) JToolBar (String title, int orientation ) Dockable? Adding a button to toolbar Methods Layouts Manager and Menus / Session2 / 22 of 23

  23. Module 4 Summary Layouts Manager and Menus / Session2 / 23 of 23

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